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ddbaf13e MH |
1 | /* |
2 | * | |
3 | * Generic Bluetooth SDIO driver | |
4 | * | |
5 | * Copyright (C) 2007 Cambridge Silicon Radio Ltd. | |
6 | * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org> | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/skbuff.h> | |
33 | ||
b4cdaba2 | 34 | #include <linux/mmc/host.h> |
ddbaf13e MH |
35 | #include <linux/mmc/sdio_ids.h> |
36 | #include <linux/mmc/sdio_func.h> | |
37 | ||
38 | #include <net/bluetooth/bluetooth.h> | |
39 | #include <net/bluetooth/hci_core.h> | |
40 | ||
ddbaf13e MH |
41 | #define VERSION "0.1" |
42 | ||
43 | static const struct sdio_device_id btsdio_table[] = { | |
44 | /* Generic Bluetooth Type-A SDIO device */ | |
45 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, | |
46 | ||
47 | /* Generic Bluetooth Type-B SDIO device */ | |
48 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, | |
49 | ||
fb3d8eb4 DV |
50 | /* Generic Bluetooth AMP controller */ |
51 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, | |
52 | ||
ddbaf13e MH |
53 | { } /* Terminating entry */ |
54 | }; | |
55 | ||
56 | MODULE_DEVICE_TABLE(sdio, btsdio_table); | |
57 | ||
58 | struct btsdio_data { | |
59 | struct hci_dev *hdev; | |
60 | struct sdio_func *func; | |
61 | ||
62 | struct work_struct work; | |
63 | ||
64 | struct sk_buff_head txq; | |
65 | }; | |
66 | ||
67 | #define REG_RDAT 0x00 /* Receiver Data */ | |
68 | #define REG_TDAT 0x00 /* Transmitter Data */ | |
69 | #define REG_PC_RRT 0x10 /* Read Packet Control */ | |
70 | #define REG_PC_WRT 0x11 /* Write Packet Control */ | |
71 | #define REG_RTC_STAT 0x12 /* Retry Control Status */ | |
72 | #define REG_RTC_SET 0x12 /* Retry Control Set */ | |
73 | #define REG_INTRD 0x13 /* Interrupt Indication */ | |
74 | #define REG_CL_INTRD 0x13 /* Interrupt Clear */ | |
75 | #define REG_EN_INTRD 0x14 /* Interrupt Enable */ | |
76 | #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ | |
bc721970 | 77 | #define REG_MD_SET 0x20 /* Bluetooth Mode Set */ |
ddbaf13e MH |
78 | |
79 | static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) | |
80 | { | |
81 | int err; | |
82 | ||
83 | BT_DBG("%s", data->hdev->name); | |
84 | ||
85 | /* Prepend Type-A header */ | |
86 | skb_push(skb, 4); | |
87 | skb->data[0] = (skb->len & 0x0000ff); | |
88 | skb->data[1] = (skb->len & 0x00ff00) >> 8; | |
89 | skb->data[2] = (skb->len & 0xff0000) >> 16; | |
618e8bc2 | 90 | skb->data[3] = hci_skb_pkt_type(skb); |
ddbaf13e MH |
91 | |
92 | err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); | |
93 | if (err < 0) { | |
7644d63d | 94 | skb_pull(skb, 4); |
ddbaf13e MH |
95 | sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); |
96 | return err; | |
97 | } | |
98 | ||
99 | data->hdev->stat.byte_tx += skb->len; | |
100 | ||
101 | kfree_skb(skb); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static void btsdio_work(struct work_struct *work) | |
107 | { | |
108 | struct btsdio_data *data = container_of(work, struct btsdio_data, work); | |
109 | struct sk_buff *skb; | |
110 | int err; | |
111 | ||
112 | BT_DBG("%s", data->hdev->name); | |
113 | ||
114 | sdio_claim_host(data->func); | |
115 | ||
116 | while ((skb = skb_dequeue(&data->txq))) { | |
117 | err = btsdio_tx_packet(data, skb); | |
118 | if (err < 0) { | |
119 | data->hdev->stat.err_tx++; | |
120 | skb_queue_head(&data->txq, skb); | |
121 | break; | |
122 | } | |
123 | } | |
124 | ||
125 | sdio_release_host(data->func); | |
126 | } | |
127 | ||
128 | static int btsdio_rx_packet(struct btsdio_data *data) | |
129 | { | |
130 | u8 hdr[4] __attribute__ ((aligned(4))); | |
131 | struct sk_buff *skb; | |
132 | int err, len; | |
133 | ||
134 | BT_DBG("%s", data->hdev->name); | |
135 | ||
136 | err = sdio_readsb(data->func, hdr, REG_RDAT, 4); | |
137 | if (err < 0) | |
138 | return err; | |
139 | ||
140 | len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); | |
141 | if (len < 4 || len > 65543) | |
142 | return -EILSEQ; | |
143 | ||
144 | skb = bt_skb_alloc(len - 4, GFP_KERNEL); | |
145 | if (!skb) { | |
146 | /* Out of memory. Prepare a read retry and just | |
147 | * return with the expectation that the next time | |
d98422cb DR |
148 | * we're called we'll have more memory. |
149 | */ | |
ddbaf13e MH |
150 | return -ENOMEM; |
151 | } | |
152 | ||
153 | skb_put(skb, len - 4); | |
154 | ||
155 | err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); | |
156 | if (err < 0) { | |
cbfd24a7 | 157 | kfree_skb(skb); |
ddbaf13e MH |
158 | return err; |
159 | } | |
160 | ||
161 | data->hdev->stat.byte_rx += len; | |
162 | ||
618e8bc2 | 163 | hci_skb_pkt_type(skb) = hdr[3]; |
ddbaf13e | 164 | |
e1a26170 | 165 | err = hci_recv_frame(data->hdev, skb); |
2fa99342 | 166 | if (err < 0) |
ddbaf13e | 167 | return err; |
ddbaf13e MH |
168 | |
169 | sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static void btsdio_interrupt(struct sdio_func *func) | |
175 | { | |
176 | struct btsdio_data *data = sdio_get_drvdata(func); | |
177 | int intrd; | |
178 | ||
179 | BT_DBG("%s", data->hdev->name); | |
180 | ||
181 | intrd = sdio_readb(func, REG_INTRD, NULL); | |
182 | if (intrd & 0x01) { | |
183 | sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); | |
184 | ||
185 | if (btsdio_rx_packet(data) < 0) { | |
186 | data->hdev->stat.err_rx++; | |
187 | sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); | |
188 | } | |
189 | } | |
190 | } | |
191 | ||
192 | static int btsdio_open(struct hci_dev *hdev) | |
193 | { | |
155961e8 | 194 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
195 | int err; |
196 | ||
197 | BT_DBG("%s", hdev->name); | |
198 | ||
ddbaf13e MH |
199 | sdio_claim_host(data->func); |
200 | ||
201 | err = sdio_enable_func(data->func); | |
e9ca8bf1 | 202 | if (err < 0) |
ddbaf13e | 203 | goto release; |
ddbaf13e MH |
204 | |
205 | err = sdio_claim_irq(data->func, btsdio_interrupt); | |
206 | if (err < 0) { | |
207 | sdio_disable_func(data->func); | |
ddbaf13e MH |
208 | goto release; |
209 | } | |
210 | ||
211 | if (data->func->class == SDIO_CLASS_BT_B) | |
bc721970 | 212 | sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); |
ddbaf13e MH |
213 | |
214 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); | |
215 | ||
216 | release: | |
217 | sdio_release_host(data->func); | |
218 | ||
219 | return err; | |
220 | } | |
221 | ||
222 | static int btsdio_close(struct hci_dev *hdev) | |
223 | { | |
155961e8 | 224 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
225 | |
226 | BT_DBG("%s", hdev->name); | |
227 | ||
ddbaf13e MH |
228 | sdio_claim_host(data->func); |
229 | ||
230 | sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); | |
231 | ||
232 | sdio_release_irq(data->func); | |
233 | sdio_disable_func(data->func); | |
234 | ||
235 | sdio_release_host(data->func); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static int btsdio_flush(struct hci_dev *hdev) | |
241 | { | |
155961e8 | 242 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
243 | |
244 | BT_DBG("%s", hdev->name); | |
245 | ||
246 | skb_queue_purge(&data->txq); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
7bd8f09f | 251 | static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
ddbaf13e | 252 | { |
155961e8 | 253 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
254 | |
255 | BT_DBG("%s", hdev->name); | |
256 | ||
618e8bc2 | 257 | switch (hci_skb_pkt_type(skb)) { |
ddbaf13e MH |
258 | case HCI_COMMAND_PKT: |
259 | hdev->stat.cmd_tx++; | |
260 | break; | |
261 | ||
262 | case HCI_ACLDATA_PKT: | |
263 | hdev->stat.acl_tx++; | |
264 | break; | |
265 | ||
266 | case HCI_SCODATA_PKT: | |
267 | hdev->stat.sco_tx++; | |
268 | break; | |
269 | ||
270 | default: | |
271 | return -EILSEQ; | |
272 | } | |
273 | ||
274 | skb_queue_tail(&data->txq, skb); | |
275 | ||
276 | schedule_work(&data->work); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
ddbaf13e MH |
281 | static int btsdio_probe(struct sdio_func *func, |
282 | const struct sdio_device_id *id) | |
283 | { | |
284 | struct btsdio_data *data; | |
285 | struct hci_dev *hdev; | |
286 | struct sdio_func_tuple *tuple = func->tuples; | |
287 | int err; | |
288 | ||
289 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); | |
290 | ||
291 | while (tuple) { | |
292 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); | |
293 | tuple = tuple->next; | |
294 | } | |
295 | ||
b4cdaba2 HG |
296 | /* BCM43341 devices soldered onto the PCB (non-removable) use an |
297 | * uart connection for bluetooth, ignore the BT SDIO interface. | |
298 | */ | |
299 | if (func->vendor == SDIO_VENDOR_ID_BROADCOM && | |
300 | func->device == SDIO_DEVICE_ID_BROADCOM_43341 && | |
301 | !mmc_card_is_removable(func->card->host)) | |
302 | return -ENODEV; | |
303 | ||
3a382772 | 304 | data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); |
ddbaf13e MH |
305 | if (!data) |
306 | return -ENOMEM; | |
307 | ||
308 | data->func = func; | |
309 | ||
310 | INIT_WORK(&data->work, btsdio_work); | |
311 | ||
312 | skb_queue_head_init(&data->txq); | |
313 | ||
314 | hdev = hci_alloc_dev(); | |
3a382772 | 315 | if (!hdev) |
ddbaf13e | 316 | return -ENOMEM; |
ddbaf13e | 317 | |
c13854ce | 318 | hdev->bus = HCI_SDIO; |
155961e8 | 319 | hci_set_drvdata(hdev, data); |
ddbaf13e | 320 | |
fb3d8eb4 DV |
321 | if (id->class == SDIO_CLASS_BT_AMP) |
322 | hdev->dev_type = HCI_AMP; | |
323 | else | |
ca8bee5d | 324 | hdev->dev_type = HCI_PRIMARY; |
fb3d8eb4 | 325 | |
ddbaf13e MH |
326 | data->hdev = hdev; |
327 | ||
328 | SET_HCIDEV_DEV(hdev, &func->dev); | |
329 | ||
330 | hdev->open = btsdio_open; | |
331 | hdev->close = btsdio_close; | |
332 | hdev->flush = btsdio_flush; | |
333 | hdev->send = btsdio_send_frame; | |
ddbaf13e | 334 | |
de8b5828 MH |
335 | if (func->vendor == 0x0104 && func->device == 0x00c5) |
336 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); | |
337 | ||
ddbaf13e MH |
338 | err = hci_register_dev(hdev); |
339 | if (err < 0) { | |
340 | hci_free_dev(hdev); | |
ddbaf13e MH |
341 | return err; |
342 | } | |
343 | ||
344 | sdio_set_drvdata(func, data); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static void btsdio_remove(struct sdio_func *func) | |
350 | { | |
351 | struct btsdio_data *data = sdio_get_drvdata(func); | |
352 | struct hci_dev *hdev; | |
353 | ||
354 | BT_DBG("func %p", func); | |
355 | ||
356 | if (!data) | |
357 | return; | |
358 | ||
359 | hdev = data->hdev; | |
360 | ||
361 | sdio_set_drvdata(func, NULL); | |
362 | ||
363 | hci_unregister_dev(hdev); | |
364 | ||
365 | hci_free_dev(hdev); | |
366 | } | |
367 | ||
368 | static struct sdio_driver btsdio_driver = { | |
369 | .name = "btsdio", | |
370 | .probe = btsdio_probe, | |
371 | .remove = btsdio_remove, | |
372 | .id_table = btsdio_table, | |
373 | }; | |
374 | ||
375 | static int __init btsdio_init(void) | |
376 | { | |
377 | BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); | |
378 | ||
379 | return sdio_register_driver(&btsdio_driver); | |
380 | } | |
381 | ||
382 | static void __exit btsdio_exit(void) | |
383 | { | |
384 | sdio_unregister_driver(&btsdio_driver); | |
385 | } | |
386 | ||
387 | module_init(btsdio_init); | |
388 | module_exit(btsdio_exit); | |
389 | ||
390 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
391 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
392 | MODULE_VERSION(VERSION); | |
393 | MODULE_LICENSE("GPL"); |